HIGH
CVE-2026-4519
Published: March 20, 2026· Updated: Mar 25, 2026
7.0
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.4th
Official Description
The webbrowser.open() API would accept leading dashes in the URL which
could be handled as command line options for certain web browsers. New
behavior rejects leading dashes. Users are recommended to sanitize URLs
prior to passing to webbrowser.open().
Technical Analysis
CVE-2026-4519 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation does not require any privileges, though user interaction (A) is needed, which slightly reduces the risk of mass automated attacks.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionA
ScopeX
Impact
Confidentiality
Integrity
Availability
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
All References (10)
Quick Facts
CVE IDCVE-2026-4519
CVSS Score7.0 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.01%
PublishedMar 20, 2026
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-4519 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.